On 02/15/2016 04:21 PM, Rick Stevens wrote:
On 02/15/2016 03:42 PM, Mike Wright wrote:
Does the boot process leave any footprints behind telling where it
booted from?
You can always "cat /proc/cmdline" to see what the boot command line
was. In my case:
[root@prophead ~]# cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.3.4-200.fc22.x86_64
root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap
vconsole.font=latarcyrheb-sun16 rd.lvm.lv=fedora/root rhgb quiet
LANG=en_US.UTF-8
So it booted the 4.3.4-200.fc22.x86_64 kernel (yes, this machine is
still F22) and the current /dev/mapper/fedora-root is the root of my
filesystem. Digging a bit more:
[root@prophead ~]# ls -l /dev/mapper/fedora-root
lrwxrwxrwx. 1 root root 7 Feb 1 15:09 /dev/mapper/fedora-root
-> ../dm-1
[root@prophead ~]# ls -l /dev/dm-1
brw-rw----. 1 root disk 253, 1 Feb 1 15:09 /dev/dm-1
So, /dev/mapper/fedora-root is is /dev/dm-1 or device major 253, minor
1. Dig a bit deeper:
[root@prophead ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 931G 0 part
├─fedora-swap 253:0 0 15.6G 0 lvm [SWAP]
├─fedora-root 253:1 0 606.8G 0 lvm /
├─fedora-home 253:2 0 293G 0 lvm /home
└─fedora-tmp 253:3 0 15.6G 0 lvm /tmp
sdb 8:16 0 465.8G 0 disk
└─sdb1 8:17 0 465.8G 0 part /media/500GB-Drive
sr0 11:0 1 2K 0 rom
So you can see my boot partition is a plain-old partition on /dev/sda1
and the root filesystem (block device 253:1) is a Linux LVM living on
/dev/sda2.
Does that help any?
Hi Rick,
Thanks but not the cigar I was looking for. "lsblk" has 49 entries,
none of which are boot which would seem to indicate /boot in question is
on the mapped root. But changes made to that grub.cfg don't show up in
the options available in the subsequent boot. Since that does seem to
be the smoking gun I'll check it again.
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